Tetrakain Bausch & Lomb

What Is Tetrakain Bausch & Lomb and What Is It Used For?

Tetrakain Bausch & Lomb belongs to the ester-type local anesthetic class of medications. Its active ingredient, tetracaine hydrochloride, works by blocking voltage-gated sodium channels in the nerve fibers of the cornea and conjunctiva. This prevents the generation and transmission of pain signals from the eye surface, producing a temporary state of local anesthesia.

The product is formulated as a sterile 1% solution supplied in individual single-dose containers. Each container holds 0.5 ml of solution, and each milliliter contains 10 mg of tetracaine hydrochloride. The single-dose format is designed to minimize the risk of microbial contamination, which is particularly important for ophthalmic preparations that come into direct contact with the delicate tissues of the eye.

Tetracaine is one of the most widely used topical ophthalmic anesthetics worldwide. It has been in clinical use since the early twentieth century and remains a first-line choice in many ophthalmology departments and eye clinics globally. According to the World Health Organization (WHO), local anesthetics for ophthalmic use are considered essential medicines in healthcare systems, underlining their importance in routine clinical practice.

Common Clinical Uses

Healthcare professionals use Tetrakain Bausch & Lomb for a variety of diagnostic and therapeutic ophthalmic procedures, including:

• Tonometry — Measuring intraocular pressure (IOP) during glaucoma screening. The Goldmann applanation tonometer requires corneal anesthesia before the tonometer tip contacts the eye surface.
• Foreign body removal — Removing superficial foreign bodies from the cornea or conjunctiva. Anesthesia allows the patient to remain still and comfortable during the procedure.
• Gonioscopy — Examining the drainage angle of the eye using a specialized contact lens. Corneal anesthesia is required for lens placement.
• Schirmer’s test — Measuring tear production to diagnose dry eye conditions. Some protocols use anesthetic drops before placing the test strip.
• Conjunctival and corneal procedures — Minor surgical procedures such as conjunctival biopsy, suture removal, or debridement of corneal epithelium.
• Diagnostic examinations — Facilitating comfortable examination when the patient has significant ocular pain or photophobia that prevents adequate assessment.

What Should You Know Before Using Tetrakain Bausch & Lomb?

Before any medication is administered, it is important that your healthcare provider has complete information about your medical history, current medications, and any known allergies. Although Tetrakain Bausch & Lomb is applied topically to the eye and systemic absorption is minimal, certain precautions are still necessary to ensure patient safety.

Contraindications

You should not use Tetrakain Bausch & Lomb if you have a known allergy (hypersensitivity) to tetracaine hydrochloride or to any of the other ingredients in the formulation. The inactive ingredients include hydrochloric acid and purified water.

Patients with a history of allergic reactions to other ester-type local anesthetics (such as procaine, benzocaine, or chloroprocaine) may have cross-sensitivity to tetracaine, as these drugs share a similar chemical structure. If you have experienced adverse reactions to any local anesthetic in the past, inform your healthcare provider before tetracaine is used.

Warnings and Precautions

Corneal damage from prolonged use: One of the most important safety considerations with topical ophthalmic anesthetics is the risk of corneal toxicity from repeated or prolonged application. Tetracaine, like other topical anesthetics, can inhibit corneal epithelial healing and cause direct toxic effects on the corneal epithelium. This is why the medication should only be used in single applications or short series during clinical procedures, and should never be prescribed for ongoing pain management at home.

Eye protection during anesthesia: While the eye is anesthetized, the normal blink reflex and pain sensation are suppressed. This means the eye is temporarily vulnerable to injury from dust, debris, or other foreign particles that would normally trigger a protective blink response. Patients should be instructed to protect their eyes from potential irritants until sensation returns, typically within 15–20 minutes.

According to the European Medicines Agency (EMA) and the American Academy of Ophthalmology (AAO), topical ophthalmic anesthetics should be used with caution in patients with pre-existing corneal disease, corneal erosions, or other conditions that may impair corneal epithelial integrity. In these patients, the risk of corneal toxicity is increased.

Pregnancy and Breastfeeding

Tetrakain Bausch & Lomb can be used during pregnancy and breastfeeding. The topical ophthalmic route of administration results in minimal systemic absorption of tetracaine, meaning that the amount of drug reaching the bloodstream is negligible. As a result, the potential for fetal or neonatal exposure through placental transfer or breast milk is extremely low.

The British National Formulary (BNF) and the EMA do not list tetracaine ophthalmic drops as contraindicated in pregnancy or lactation. However, as with all medications during pregnancy, the decision to use should be made by a healthcare professional who can weigh the clinical need for the procedure against any theoretical risks.

Driving and Operating Machinery

Tetrakain Bausch & Lomb can cause temporary blurred vision after application. This side effect is transient and typically resolves within 15–30 minutes, but during this period, visual acuity may be reduced. You should not drive or operate machinery until your vision has fully returned to normal.

It is your responsibility to assess whether you are fit to drive or perform tasks that require sharp vision. If you have any doubt about your visual capacity after receiving tetracaine eye drops, wait until you are confident that your sight is clear before engaging in activities that demand good visual function.

How Does Tetrakain Bausch & Lomb Interact with Other Drugs?

Drug interactions with topical ophthalmic tetracaine are relatively limited compared to systemically administered medications. This is because the drug is applied directly to the eye surface and systemic absorption is minimal. However, local interactions at the ocular surface can still occur and should be considered by healthcare professionals.

The most clinically significant interaction is between tetracaine and sulfonamide antibiotics. Tetracaine is metabolized by plasma cholinesterases to produce para-aminobenzoic acid (PABA), which is structurally similar to the sulfonamide antibiotics’ target substrate. PABA can competitively antagonize the antibacterial action of sulfonamides, potentially reducing their efficacy. For this reason, if sulfonamide antibiotic eye drops are being used, healthcare providers should be aware of this interaction and may consider timing the administration of the two drugs to minimize direct contact at the ocular surface.

Beyond these specific interactions, it is always good practice to inform your healthcare provider about all medications you are taking, including prescription drugs, over-the-counter medicines, eye drops, and herbal supplements. This allows them to make a comprehensive assessment of potential interactions and adjust your treatment plan accordingly.

The single-dose formulation of Tetrakain Bausch & Lomb is preservative-free, which reduces the risk of preservative-related corneal epithelial damage and interactions with other topical ophthalmic medications that may contain preservatives.

What Is the Correct Dosage of Tetrakain Bausch & Lomb?

Tetrakain Bausch & Lomb is administered exclusively by healthcare professionals in clinical settings. The dosage is straightforward, but proper technique is important to ensure effective anesthesia while minimizing the risk of adverse effects.

Adults

For procedures requiring deeper or more prolonged anesthesia, some clinical protocols recommend instilling a second drop 60–90 seconds after the first. This “top-up” approach can extend the duration of effective anesthesia without significantly increasing the total dose applied to the corneal surface.

Children

In pediatric ophthalmology, tetracaine eye drops are commonly used for examinations such as retinopathy of prematurity (ROP) screening in premature neonates, tonometry, and foreign body removal. The safety profile in children is well established through decades of clinical use.

Elderly

Administration Technique

Proper administration technique is essential for effective anesthesia:

1. Remove the single-dose container from its outer protective pouch.
2. Twist off the cap of the container using a twisting motion.
3. Instill the drops into the conjunctival sac (lower eyelid pouch) immediately after opening.
4. Discard the single-dose container after use, even if solution remains — single-dose containers are not designed for reuse.
5. Wait 20–30 seconds for anesthesia to develop before commencing the procedure.

Overdose

Topical overdose with tetracaine eye drops is unlikely in the clinical setting where it is administered by trained healthcare professionals. If an excessive amount is accidentally applied to the eye, the main concern is increased risk of corneal epithelial toxicity. The eye should be gently irrigated with sterile saline solution.

In the extremely unlikely event of accidental ingestion (for example, if a child swallows the solution), contact a poison control center or emergency medical services immediately. Systemic toxicity from ester-type local anesthetics can include central nervous system symptoms (dizziness, tremor, seizures) and cardiovascular effects (hypotension, bradycardia), although these are exceedingly rare from the small volumes contained in ophthalmic single-dose units.

What Are the Side Effects of Tetrakain Bausch & Lomb?

Like all medications, Tetrakain Bausch & Lomb can cause side effects, although not everyone who receives it will experience them. Most side effects are mild, localized to the eye, and resolve quickly without treatment. The side effects are categorized below by their frequency of occurrence according to standard medical terminology.

The mechanism behind most of these side effects relates to the direct pharmacological action of tetracaine on the corneal epithelium. While a single application for a diagnostic procedure carries minimal risk, repeated applications can disrupt the delicate balance of corneal epithelial cell turnover and compromise the integrity of the corneal surface.

Studies published in the British Journal of Ophthalmology and Cornea have documented cases of severe corneal toxicity (“anesthetic abuse keratopathy”) in patients who obtained topical anesthetics for unsupervised self-administration. These cases underline the importance of restricting use to the clinical setting under professional supervision.

When to Seek Medical Attention

While most side effects are transient and self-limiting, you should contact your healthcare provider if you experience any of the following after receiving tetracaine eye drops:

• Persistent eye pain that does not resolve within 30 minutes
• Significant redness or swelling that worsens over time
• Blurred vision that does not improve within one hour
• Signs of allergic reaction such as severe itching, swelling of the face or throat, or difficulty breathing
• Any visible changes to the cornea or eye surface

How Should You Store Tetrakain Bausch & Lomb?

Proper storage is essential to maintain the safety, sterility, and efficacy of Tetrakain Bausch & Lomb. As an ophthalmic preparation that is applied directly to the delicate tissues of the eye, maintaining product integrity is critical.

Storage Conditions

• Temperature: Store at or below 25°C (77°F). Do not freeze the product, as freezing can alter the solution’s properties and potentially damage the single-dose containers.
• Light protection: Keep in the original packaging. Tetracaine is sensitive to light and can undergo photodegradation if exposed to direct sunlight or strong artificial light for prolonged periods.
• Single-dose use: Each container is designed for one-time use only. Once opened, the solution should be instilled immediately. Discard any remaining solution along with the opened container. Do not attempt to save opened containers for later use, as the product is preservative-free and microbial contamination can occur rapidly.
• Children: Keep this medicine out of the sight and reach of children.
• Expiry date: Do not use after the expiry date stated on the label and carton. The expiry date refers to the last day of the stated month.

Disposal

Do not dispose of medicines via household waste or down the drain. Return unused or expired medications to a pharmacy or follow your local guidelines for safe disposal of pharmaceutical waste. Proper disposal protects the environment and prevents accidental exposure.

What Does Tetrakain Bausch & Lomb Contain?

Understanding the full composition of a medication is important, particularly for patients with known sensitivities or allergies to specific pharmaceutical ingredients. Tetrakain Bausch & Lomb has a simple formulation with minimal excipients, which reduces the risk of hypersensitivity reactions.

Active Ingredient

Tetracaine hydrochloride 10 mg/ml (1% w/v) — Tetracaine (also known as amethocaine in some regions) is an ester-type local anesthetic. It is the hydrochloride salt form, which provides good water solubility for formulation as an aqueous solution. Tetracaine is classified under the para-aminobenzoic acid (PABA) ester group of local anesthetics.

Inactive Ingredients

• Hydrochloric acid — Used to adjust the pH of the solution to a level compatible with the eye surface, improving comfort upon instillation and stability of the tetracaine in solution.
• Purified water — The solvent base for the solution, produced to pharmacopeial standards to ensure sterility and absence of particulate matter.

Packaging

Tetrakain Bausch & Lomb is supplied as 20 single-dose soft plastic containers, each containing 0.5 ml of solution. Each single-dose container is individually sealed in an outer protective pouch. This packaging design serves multiple purposes: it maintains sterility until the point of use, protects the light-sensitive solution from photodegradation, and ensures that each application uses a fresh, uncontaminated aliquot of medication.

The manufacturer is Laboratoire Chauvin S.A., Z.I. Ripotier, 07200 Aubenas, France. The marketing authorization holder is Bausch + Lomb Ireland Limited, 3013 Lake Drive, Citywest Business Campus, Dublin 24, D24 PPT3, Ireland.